Cooking-stove



J. SPEAR.

Cooking Stove.

' Patented April 13, 1858.

UNITED STATES PATEN T OFFICE.

JAS. SPEAR, OF PHILADELPHIA, PENNSYLVANIA.

COOKING-STOVE.

Specification of Letters Patent No. 19,956, dated April 13. 18558.

To all whom it may concern:

Be it known that I, JAMEs SPEAK, of the city and county of Philadelphia,in the State of Pennsylvania, have invented certain new and usefulImprovements in Cooking-Stoves; and I hereby declare that the followingis a full, clear, and exact description of the same, reference being hadto the accompanying drawings, making part of this specification, inwhich Figure 1 is a perspective view of a cooking stove with myimprovement attached, one side of the stove being removed, and Fig. 2 abottom view of the center piece.

My improvements relate to the means by which minute jets of heated airare introduced at pleasure into cooking stoves or ranges immediatelyabove the ignited fuel, for the purpose of aiding the conversion intoflame of the greater portion of the gaseous products of combustion,which would otherwise pass off through the flues without being consumed.

I effect the above object in the present instance by a hollow centerpiece (p) formed with a perforated bottom piece, which is connected atb, with the branches t which pass through the flues of the oven,following their course, and communicating by openings 0 at two pointswith the external air, the admission of which is controlled andregulated at pleasure by covers or slides a. The air, heated in itspassage through the tubes, is ejected in numerous jets as indicated bythe darts, thoroughly mixing with and causing the ignition of the gases,the fiame from which, passing through the flues, heats the oven or otherportions of the stove with which it comes in contact, much more quicklyand produces a greater amount of heat from a given quantity of fuel. Theabove described construction has the additional advantages ofstrengthening the center piece, and protectmg it from the destructiveeffect of excessive heat by the non-conductive property of the aircontained therein. The same ar rangement and construction may be appliedto the front center piece immediately over the fire with similarresulting advantages. A very superior effect is produced in thelgnition, and consequent utilization of the gaseous products ofcombustion, by the application of jets of heated air upon the uppersurface of the fire, to that which is experienced from the admission ofcold air, above the fire through the fuel opening f, or any otheropening, communicating directly with the external air. In the lattercase the gases are partially chilled and driven unconsumed through theflues, while the strength of the draft through the grate isproportionably diminished. In my improvement of the intimate mixture ofthe numerous small orifices, allow heated aii' with the gases, withoutimpairing the strength of the draft in any appreciable degree.

The tubes may either be added to the existing patterns of cooking stovesor ranges or may be cast in connection with the flues as may be mostconvenient.

that I claim as my invention and desire to secure by Letters Patent ofthe United States is The hollow center piece 79 when connected with thehot air tube t, and constructed in the manner and for the purposes setforth.

Intestimony whereof I have signed my name to this specification beforetwo subscribing witnesses.

JAMES SPEAR.

Witnesses:

JAMES M. MGDONNELL, WILLIAM THOMPSON.

